oe stuttgart



Oct. 23, 1928. i

w. WALTHER ET AL IGNITION DEVICE Filed Aug. 8, 1927 Fig. 2

Fig. 7

310mm Wm WM v2 interrupter as a whole.

Patented Cat. 23, 1928. v 2

UNITED, STATES.

PATENT OFFICE.

WILHELM WALTHEB AND GOTTHILF RAU, OF STUTTGART, GERMANY, ASSIGNORS TO ROBERT BOSCH AKTIENGESELLSGHAFT, OF STUTTGART, GERMANY.

IGNITION DEVICE.

Application filed August 8, 1927, Serial No. 211,496, and in Germany August 27, 1926-.

The present invention relates generally to ignition systems for internal combustion en-' gines, and more particularly to adjustable interrupters or timers for such systems, of the 5 type in which the normally stationary part ofthe interrupter is turned or adjusted with reference to the rotary part for adjusting or timing the ignition.

Remote control ofsuch devices may be efmay be readily attached as a part of the interrupter device, when needed for the purpose just mentioned, with substantially no change in the appearance of the latter and without adding to the mounting space required by the Another abject is to provide an adjustable circuit breaker or interrupter of the above general type especially adapted to be furnished with or without the detachable unit according to the requirements, without substantial variation in the structure or appearance of the adjustable interrupter itself.

Other objects and advantages of the inven-' tion will be ap arent from a perusal of the following speci cation and the drawings accompanying same.

In the drawings: Fig. 1 is a section through the interrupter casing and its support taken on the line 40 m-y of Fig. 2.

Fig. 2 is a front view of the adjustable interrupter applied to'an ignition device.

Referring to the drawings in detail, the cylindrical casing a which also forms the cam ring of the interrupter mechanism in the usual manner, is rotatably mounted on the cylindrical extension 6' of a stationary memher 0 here shown as a stationary portion of a magneto generator. The rotary movement I 0 of the cam ring or casing a is restricted or held within predetermined limits by the stop means consisting, in the example illustrated, of the pin d carried by the casing a, pm (1 engag ng an are shaped slot 6 in the stat onar portion a. An operating means for ad] usta ly rotating the casing a is provided and takes the form,in the present instance, of an adjusting lever f fastened to the casing a by means of a clamping band 9 which is secured at both ends to the lever f, and embraces the casing in clamping engagement therewith. The lever f may be remotely controlled in any well known or other suitable manner not shown, as by a system of rigid rods and bell crank levers or by a flexible cable or pull wire.

For efiecting return movement ofthe casing 11 where a cable or flexible wire is used for moving the lever, a detachable unit consisting, in the example shown, of a helical spring 71, mounted in a sleeve like holder consisting of an annular spring box a is provided. Spring box 2' has a cylindrical flange exten- S1011 m slotted as indicated in dotted lines at n to enable it to be clamped tightly around the casing a by means of the same clamping band which holds the lever The spring; 71. has one end is fastened in the wall of the spring box 2' and the other end provided with a projecting portion Z for attaching it to the stationary member 0 by engagement with an opening in the latter. Theparts are so proportioned and adjusted that when assembled as shown, the retractile spring I), will tend to i hold the casing a in one-of its limits of adjustment as determined by the stop means d-e.

In operation, with the parts connected as described, when the lever f is pulled to rotate the casing a away from its initial position or limit of adjustment in which it is held by the spring, the spring will be put under ten sion and will then operate to return the casing to normal position when the pull on the cable or other operating means is released.

It will be apparent from the above that with the present invention the same adjustable interrupter device may be furnished for use with or without the spring mechanism without necessitating any change in the structure or general appearance of the adjustable interrupter itself. The spring and its housing are easily attached or detached, the housing being heldin place by the same clamping means which holds the lever f in place.

While we have shown the invention applied to a magneto ignition device it will be obvious that it may be applied to any other form of ignition device using a similar adjustable timing element, and that while one specific embodiment of the invention has been described in detail, the invention is not limited to such specific embodiment but contemplates all such embodiments and variants thereof as fall within the scope of the appended claims.

What is claimed is:

1. In an ignition device having a cylindrical interrupter casing rotatably mounted on a support for timing the ignition; the combination ota sleeve arranged to fit over and around the cylindrical walls of the interrupter casing and to be secured thereto for movement therewith, a spring mounted within the sleeve with one end secured to the sleeve and the other end secured to the support. I

2. In an ignition system an interrupter having a stationary part and a cylindrical casing rotatably adjustable for timing the ignition, operating means for rotating said casing, holding means for securing said operating means to the casing .in fixed relation thereto, an annular spring housing arranged to fit over and around said casing and carried by a sleeve arranged to be secured to the cas ing together withsaid operating means by said holding means at will, a'spring mounted in said housing having one end lixed to the housing, and means for securing the other end of the spring to said stationary part at will;

3. In an ignition system an intr-irrupter having a stationary part and a cylindrical casing rotatably adjustable for timing the ignition, operating means for rotating said casing, holding means for securing said operating means to the casing in fixed relation thereto, an annular spring housing arranged to fit over and around said casing and carried by a sleeve arranged to be secured to the easing together with said operating means by said holding means at will, a spring mounted in said housing having one end fixed to the housing, and means for securing the other end of the spring to said stationary part at will, together with stop means arranged to hold the casing in a glven normal position against the tension of the spring.

4. In an ignition system an interrupter having a stationary part and a cylindrical casing rotatably adjustable for timing the ignition, an operating lever for rotating said casing, a clamping band arranged to embrace the casing and. hold the lever in fixed relation thereto, together with an annular spring box adapted to fit over and around the casing, an annular mounting flange for the,..spring box in the form of a split sleeve arranged to fit around the casing and to be clamped thereto at will by said clamping band, a helical spring mounted in said spring box having one end fixed to the box and the other end detachably connected to said stationary part.

5. In an ignition system having a circuit breaker in which adjustment of the time of ignition is effected by rotation oi a cylin drical circuit breaker casing in relation to a stationary member; the combination of an operating handle, clamping means arranged to embrace the casing and clamp the handle fixedly thereto, a cylindrical sleeve member arranged to fit over the casing to' be clamped thereto, together with the handle by said clamping means, a coil spring mounted in said sleeve member between the latter and the casing and having one end fixed to said sleeve member, and means for attaching the other end of the spring to the stationary member.

6. In an ignition system, an interrupter having a cylindrical casing adjustable for timing the ignition, a spring arranged to hold the casing in a given normal position, and a hollow sleeve detachably secured to the outside cylindrical surface of said casing and enclosing said spring.

7. In an ignition system having a circuit breaker in which adjustment of the time of ignition is effected by rotation of a cylindrical cirpuit breaker casing in relation to a stationary member; the combination of an operating handle, clamping means arranged to embrace the casing and clamp the handle fixedly thereto, an annular spring box arranged to fit around the casing near the stationary member, an attaching flange on said spring box in the form of a sleeve proportioned to fit over the casing between'the latter and the clamping means, said sleeve being split to permit reduction of its inside circumference, a spring mounted in said spring housing having one endattached to the housing, and means for attaching the other end of the spring to the stationary member.

In testimony whereof we have hereunto atfixed our signatures.

WILHELM WVALTHER. GOTTHILF RAU. 

